The　spark　plasma　sintering　(SPS)　technique　was　introduced　into　the　field　of　NdFeB　preparation　due　to　its　own　advantages.　High　property　NdFeB　magnets　with　fine　grains　were　prepared　by　SPS　method.　The　corrosion　behaviors　of　SPS　NdFeB　were　studied　by　electrochemical　measurements　and　92%　RH　hyther　tests　at　353　K.　The　results　were　compared　with　those　of　the　traditional　sintered　NdFeB　magnets.　It　shows　that　both　the　SPS　NdFeB　and　the　traditional　sintered　NdFeB　have　good　corrosion　resistance　in　alkaline　environment　due　to　surface　passivation;　while,　the　fine　grain　microstructure　of　SPS　NdFeB　results　in　a　more　homogeneous　phase　composition　distribution　and　thus　reduces　the　electrochemical　inhomogeneity　between　the　ferromagnetic　phase　and　the　Nd-rich　intergranular　phase　in　the　magnet.　Therefore,　the　SPS　NdFeB　exhibits　better　corrosion　resistance　than　the　traditional　sintered　NdFeB　in　neutral　and　weak　acidic　environment.